LH1605/LH1605C 5 Amp, High Efficiency Switching Regulator General Description Features The LH1605 is a hybrid switching regulator with high output current capabilities. It incorporates a temperature-compensated voltage reference, a duty cycle modulator with the oscillator frequency programmable, error amplifier, high current-high voltage output switch, and a power diode. The LH1605 can supply up to 5A of output current over a wide range of regulated output voltage. Y Y Y Y Y Y Step down switching regulator Output adjustable from 3.0V to 30V 5A output current High efficiency Frequency adjustable to 100 kHz Standard 8-pin TO-3 package Block and Connection Diagrams Case is Ground TL/K/10114 – 2 Top View Order Number LH1605K or LH1605CK See NS Package Number K08A TL/K/10114 – 1 C1995 National Semiconductor Corporation TL/K/10114 RRD-B30M115/Printed in U. S. A. LH1605/LH1605C 5 Amp, High Efficiency Switching Regulator February 1995 Absolute Maximum Ratings Storage Temperature Range (TSTG) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Input Voltage (VIN) b 65§ C to a 150§ C Duty Cycle (D.C.) 20% to 80% Steering Diode Reverse Voltage (VR) (V8– 7) Steering Diode Forward Current (ID) (I7– 8) 35V max Output Current (IO) 6A 150§ C Operating Temperature (TJ) Internal Power Dissipation (PD) (Note 1) 20W Operating Temperature (TA) b 25§ C to a 85§ C LH1605C b 55§ C to a 125§ C LH1605 60V 6A Electrical Characteristics TC e 25§ C, VIN e 15V, VOUT e 10V unless otherwise specified Symbol Characteristics LH1605 Conditions Min Typ 3.0 LH1605C Max Min 30 3.0 Typ Units Max VOUT Output Voltage Range VIN t VO a 5V IO e 2A (Note 2) VS Switch Saturation Voltage IC e 5.0A IC e 2.0A 1.6 1.0 2.0 1.2 1.6 1.0 2.0 1.2 VF Steering Diode On Voltage ID e 5.0A ID e 2.0A 1.2 1.0 2.8 2.0 1.2 1.0 2.8 2.0 VIN Supply Voltage Range IR Steering Diode Reverse Current VR e 25V 0.1 5.0 0.1 5.0 IQ Quiescent Current IOUT e 0.2A 20 10 35 30 10 V 35 20 mA mA V2 Voltage on Pin 2 2.5 2.5 V DV2/DT V2 Temperature Coeff. 100 100 ppm/§ C V4 Voltage SwingÐPin 4 3.0 3.0 V I4 Charging CurrentÐPin 4 70 70 mA RA Resistance Pin 3 to GND 2.0 2.0 kX DRA/DT Resistance Temp. Coeff. 75 75 ppm/§ C tr Voltage Rise Time IOUT e 2.0A IOUT e 5.0A 350 500 350 500 tf Voltage Fall Time IOUT e 2.0A IOUT e 5.0A 300 400 300 400 ts Storage Time 1.5 1.5 ms td Delay Time 100 100 ns PD Power Dissipation 16 16 W h Efficiency 75 75 % iJC Thermal Resistance (Note 1) 5.0 5.0 § C/W IOUT e 5.0A VOUT e 10V IOUT e 5.0A Note 1: iJA is typically 30§ C/W for natural convection cooling. Note 2: VOUT refers to the output voltage range of switching supply after the output LC filter as shown in the Typical Application circuit. 2 ns TL/K/10114 – 3 Minimum VIN b VOUT e 5V for Proper Operation RS e 2 c 103 (VOUT b 2.5) 2.5 VIN e 10 b 18V VOUT e 5V IOUT e 3A (Max) IOUT e 1A (Min) h j 70% Load Reg. e 50 mV Line Reg. e 10 mV Ripple e 20 mV Frequency vs Timing Capacitance Power Derating Curve TL/K/10114 – 4 TL/K/10114 – 5 Design Equations POUT c 100 Efficiency (h) e PIN Transistor DC Losses (PT) e IOUT c VS Diode DC Losses (PD) e IOUT c VF # #t tON ON a tOFF tOFF tON a tOFF J J VIN2 tON c Drive Circuit Losses (DL) e 300 tON a tOFF Switching Losses Transistor (PS) e VIN c IOUT c Transistor Duty Cycle e Diode Duty Cycle e tr a tf 2(tON a tOFF tON V e OUT tON a tOFF VIN tOFF V e 1 b OUT tON a tOFF VIN Power Inductor (PL) e IOUT2 c RL (Winding Resistance) Efficiency (h) e VOUTIOUT c 100% VOUTIOUT a PT a PD a DL a PS a PL 3 LH1605/LH1605C 5 Amp, High Efficiency Switching Regulator Physical Dimensions inches (millimeters) Lit. Ý 106377 8-Lead TO-3 Metal Can Package (K) NS Package Number K08A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 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